President Trump and the first lady arrive at Stansted airport this afternoon. They immediately boarded Marine Force One and flew into LondonMatt Dunham/AP Photo

Nato leaders will “very substantially” increase defence spending, President Trump said at an unscheduled press conference this morning, hours after apparently threatening to pull the United States out of the alliance.

Speaking after Nato leaders held an emergency session on defence spending, Mr Trump said that “tremendous progress” had been made and that other leaders had agreed to “substantially up” their spending commitments.

Other leaders had agreed to “levels they have never thought of before”.

The two-day summit at Nato’s new £1 billion headquarters on the outskirts of Brussels ends today.

Last night the president, who is due to arrive in the UK this afternoon, told other Nato members to increase defence spending from 2 per cent of GDP to 4 per cent. Some states…

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